There are only two "extracurricular" apps that I invest most of my free time in..
1. Pleco - seems to be the best Chinese dictionary and flashcard system available for iphone
2. Color Zen - A weird sensation of frustration and relaxation occurring at the same time, it's a visual puzzle/color game. Keeps the brain fresh when I'm sick of doing Chinese flashcards
i have posted a similar thread earlier with my favorites but moderator asked me not to post links. In this post you can share your favorite ipad and iphone games.
1- PuzzleR - A Combination of Puzzle, Word and Trivia Game
2- Clumsy Ninja
3- Device 6
4- The Wolf Among Us (Episode 1)
5- Castle of Illusion Starring Mickey Mouse
7- Walking Dead: The Game - Season 2
9- The Lawless
Please share yours.